George, capacitors are energy storage devices. Any energy your capacitor stores off the grid will be returned to the grid, 120 times per second.
Your meter measures power, not volt-amps. That's true whether the current is leading or lagging voltage. Let's take three examples:
1. Motor not adjusted for PF, so let's say PF is .7. A one-horsepower motor needs 746 watts, but 1066 volt-amps.
2. Motor adjusted for unity PF. Now the 1 hp motor draws 746 watts and 746 VA.
3. Motor turned off but the PF capacitor is still in the circuit. Power is now zero, although the VA will be greater than zero (not enough info to solve for VA in this condition).
The meter compensates for the phase angle between current and voltage, so you only pay for power, not VA. The power company doesn't like a lagging power factor, because it costs them money due to line losses and increased transmission capacity requirements. Leading power factors are seldom seen in the real world.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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